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How do I know if it's the battery or the unit?

APC UPS for Home and Office Forum

Schneider Electric support forum for our APC offers including Home Office UPS, Surge Protectors, UTS, software and services and associated products designed to share knowledge, installation, and configuration.

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How do I know if it's the battery or the unit?

This question was originally posted by Bernard on APC forums on 3/9/2021


Yesterday everything was fine and today I woke up with a powered off NAS and no lights on the Back-UPS 650.
The NAS went off unexpectedly, no alarm or messages.
The Back-UPS won't turn on at all. Pressing the reset on the back has no reaction.
Before I go and buy a new battery I would like to know if the unit itself is working.
How can I make sure?